Organic molecular films on gold versus conducting polymer: Influence of injection barrier height and morphology on current–voltage characteristics

Koch, N.; Elschner, A.; Schwartz, J.; Kahn, A.
April 2003
Applied Physics Letters;4/7/2003, Vol. 82 Issue 14, p2281
Academic Journal
The current-voltage characteristics I(V) of model organic devices are studied under ultra-high-vacuum conditions. Active materials are N,N'-bis-(1-naphthyl)-N,N'-diphenyll - 1,1-biphenyl1-4,4'- diamine (α-NPD) and pentacene, electrode materials are polycrystalline Au and the conductive polymer poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/ PSS). Despite a similar work function of electrode material surfaces (∼ 5 eV), hole injection from PEDOT/PSS is significantly more efficient than from Au, due to a smaller hole injection barrier. Hole injection characteristics from Au electrodes for devices made from α-NPD are independent of deposition sequence and substrate used. Pentacene devices exhibit serious asymmetries in that respect. These are caused by a strong dependence of morphology and preferred molecular orientation on the substrate for the crystalline material.


Related Articles

  • Passivation of Si(111)-7×7 by a C60 monolayer. Dunn, A. W.; Moriarty, P.; Upward, M. D.; Beton, P. H. // Applied Physics Letters;7/22/1996, Vol. 69 Issue 4, p506 

    C60 monolayers are formed on a Si(111)-7×7 surface under ultrahigh vacuum (UHV) conditions. The effects of exposure to atmosphere (for 30 min) and water (for 30 s) are assessed by comparing images of the surface acquired using an UHV scanning tunneling microscope. Following exposure and/or...

  • A High Vacuum Fracture Facility for Molecular Interactions. Liechti, K.; Na, S.; Wakamatsu, M.; Seitz, O.; Chabal, Y. // Experimental Mechanics;Feb2013, Vol. 53 Issue 2, p231 

    This paper describes the development of a high vacuum fracture rig for delaminating functionalized silicon surfaces. The main focus here is on examining molecular interactions by functionalizing the silicon surfaces with carboxyl and diamine terminated self-assembled monolayers (SAMs). However,...

  • The interface of laser-deposited Fe/Ag multilayers: evidence for the "subsurface growth mode" during pulsed-laser deposition and examination of the bcc-fcc transformation. Fähler, S.; Weisheit, M.; Kahl, S.; Sturm, K.; Krebs, H.U. // Applied Physics A: Materials Science & Processing;1999, Vol. 69 Issue 7, pS459 

    Abstract. One of the most significant features of pulsed-laser deposition (PLD) in vacuum as compared to conventional deposition methods is that a significant number of ions are deposited with a high kinetic energy of about 100 eV. Using Fe/Ag multilayers, we show that the deposition of...

  • Predicting the Drydown Rate. Danielson, Phil // R&D Magazine;Jun2005, Vol. 47 Issue 6, p26 

    Focuses on the approach that can be used in quantifying the pumpdown performance in traversing the drydown zone of a vacuum chamber. Information on the stages of volume zone and drydown zone; Factors affecting the initial desorption and net desorption rate; Impact of effective pumping speed on...

  • Ultra-high vacuum investigations of atomic layers at low temperatures.  // Low Temperature Physics;Feb98, Vol. 24 Issue 2, p134 

    Examines the ultrahigh vacuum investigations of atomic layers at low temperatures. Difference of monolayer behaviors in different substrates; Use of surface science techniques in the process; Discussion of achievements in the ultra-high vacuum techniques.

  • Adsorption, Desorption, and Contact and Thermal Transformation of C60 Molecules on a Ta(100) Surface. Gall', N. R.; Ru'kov, E. V.; Tontegode, A. Ya. // Semiconductors;Nov2005, Vol. 39 Issue 11, p1280 

    The adsorption, desorption, initial film growth, and contact and thermal transformation of C60 molecules on a Ta(100) surface in ultra high vacuum at temperatures from 300 to 2000 K are investigated. It is shown that C60 molecules from the first adsorption layer undergo a significant...

  • Photovoltaic properties of interfaces in organic molecular film-silicon structures. Komolov, A. S. // Technical Physics Letters;Jun2006, Vol. 32 Issue 6, p523 

    A photovoltaic effect was discovered and studied in the structures comprising thin films of perylenetetracarboxylic acid dianhydride (PTCDA) and oligo(phenylene-vinylene) (OPV) deposited in vacuum onto a silicon surface, as well as in the OPV/PTCDA/Si structure. A change in the surface potential...

  • Quartz microbalance device for transfer into ultrahigh vacuum systems. Stavale, F.; Niehus, H.; Achete, C. A. // Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p105102 

    An uncomplicated quartz microbalance device has been developed which is transferable into ultrahigh vacuum (UHV) systems. The device is extremely useful for flux calibration of different kinds of material evaporators. Mounted on a commercial specimen holder, the device allows fast quartz...

  • Monolayer ferromagnetism of Fe(110) on W(110) studied by Mössbauer spectroscopy. Przybylski, M.; Gradmann, U. // Journal of Applied Physics;4/15/1988, Vol. 63 Issue 8, p3652 

    Focuses on a study that discussed the preparation of iron(110) films in the monolayer regime at 300 K in ultrahigh vacuum on W(110). Factors established using LEED, AES and conversion electron Mössbauer spectroscopy; Manner of establishing ferromagnetic order for the pseudomorphic monolayer;...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics